CN102563410B - Light emitting device, projection device and lighting device - Google Patents

Light emitting device, projection device and lighting device Download PDF

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Publication number
CN102563410B
CN102563410B CN201110396413.2A CN201110396413A CN102563410B CN 102563410 B CN102563410 B CN 102563410B CN 201110396413 A CN201110396413 A CN 201110396413A CN 102563410 B CN102563410 B CN 102563410B
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China
Prior art keywords
light
material
transformation
wave length
described
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CN201110396413.2A
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Chinese (zh)
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CN102563410A (en
Inventor
张利利
许颜正
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深圳市光峰光电技术有限公司
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • F21V9/45Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity by adjustment of photoluminescent elements
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2006Lamp housings characterised by the light source
    • G03B21/2033LED or laser light sources
    • G03B21/204LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/208Homogenising, shaping of the illumination light
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/30Semiconductor lasers

Abstract

The invention provides a light emitting device, a projection device and a lighting device. The light emitting device comprises a wavelength conversion material layer and a light guiding device, wherein the wavelength conversion material layer with a first surface and a second surface comprises a wavelength conversion material and a scattering material, and the light guiding device is positioned on one side of the first surface of the wavelength conversion material layer and used for guiding exciting light into the first surface of the wavelength conversion material layer, and guiding stimulated light and residual exciting light to enter a light emitting channel, wherein the stimulated light is emitted by the first surface of the wavelength conversion material layer, and the residual exciting light is absorbed by the wavelength conversion material layer. By the aid of the light emitting device, the light guiding device positioned on one side of the first surface of the wavelength conversion material layer is effectively positioned can be used for effectively collecting the exciting light reflected by the wavelength conversion material layer, so that the efficiency of the light emitting device cannot be affected by the scattering material added by the scattering material, and the contradiction between color uniformity and light emitting efficiency is solved.

Description

Light-emitting device, projection arrangement and lighting device

Technical field

The present invention relates to optical technical field, particularly relate to light-emitting device, projection arrangement and lighting device.

Background technology

At present, solid state light emitter, due to features such as its long-life, environmental protection, is widely used in general illumination, special lighting and Projection Display.Wherein, white light solid state light emitter has huge development potentiality especially at lighting field.

White light solid state light emitter mainly contains two kinds of implementation methods, and a kind of method is to carry out synthesize white light by many monochromatic solid state light emitters, and for example red, green, blue light emitting diode (LED, Light Emitting Diode) lights to generate white light together; Another kind method be use blue-light excited yellow fluorescent powder, utilize yellow fluorescent powder be excited produce gold-tinted with do not have absorbed residue blue light to obtain white light.Second method is because it is widely used compared with high efficiency.

The impact of receiving LED light source heating in order to reduce fluorescent material, remote fluorescence powder (remote phosphor) technology has obtained increasing application, as shown in Fig. 1 a and 1b.In Fig. 1 a, exciting light 101 is incident in and is coated on a phosphor powder layer 104 on speculum 105, phosphor powder layer 104 stimulated emission Stimulated Light 103.102 is light splitting optical filters, and effect is that transmission exciting light 101 reflects Stimulated Light 103 simultaneously.Stimulated Light 103 forms emergent light after by the reflection of light splitting optical filter 102.

The problem of the scheme shown in Fig. 1 a is, emergent light only comprises Stimulated Light composition, does not comprise exciting light composition.This is because the effect of light splitting optical filter 102 is to utilize the difference of wavelength that Stimulated Light is separated from the light path of exciting light, original like this and Stimulated Light together from phosphor powder layer 104 the absorbed residual excitation light that do not have of outgoing also can under the effect of light splitting optical filter 102, separate with Stimulated Light, finally only have the Stimulated Light can outgoing.

In Fig. 1 b, exciting light 111, after incident light splitting optical filter 115 of transmission, is incident in phosphor powder layer 114.The effect of light splitting optical filter 115 is transmission exciting lights, reflection Stimulated Light.Phosphor powder layer 114 is excited the Stimulated Light of rear transmitting and is divided into two parts, and Part I directly shines space outerpace, and Part II incides that light splitting optical filter 115 is rear to be reflected by light splitting optical filter 115 and shine space outerpace.This two parts light forms emergent light 113 jointly with the residual excitation light not absorbed by fluorescent material.

Although the scheme shown in Fig. 1 b can obtain the mixed light of Stimulated Light and exciting light, there is the bad problem of color homogeneity in such mixed light.In two kinds of compositions of mixed light, the luminous light of Stimulated Light distributes and is generally lambertian distribution, it is isotropic distribution, the impact of the factors such as the light that the light distribution of exciting light is subject to inciding the exciting light 111 before fluorescent material distributes, the thickness distribution of fluorescent material, general is not desirable isotropic distribution, this has just caused the ratio regular meeting of exciting light and Stimulated Light in all directions of emergent light 113 to change, and then the color of synthetic white light is changed, destroy the color homogeneity of light source.

In fact, just there is certain scattering process to exciting light in phosphor material powder itself, a kind of method of therefore dealing with problems is the use amount that increases phosphor material powder, makes all exciting lights all must form isotropic emergent light through the scattering of phosphor material powder.But the problem of this way is that remaining exciting light is very few, the colour temperature of the white light of final outgoing is too low.That is to say, the colour temperature of white light has required the limited proportion of exciting light in emergent light and Stimulated Light, further, namely defines the use amount of phosphor material powder.

In order to increase exciting scattering of light not improve the use amount of fluorescent material simultaneously, diffusion material is widely used.For example Chinese patent 201010162062.1,200710304216.7, US Patent No. 20090065791, US6791259, US6653765, Korean Patent KR2009054841 proposes respectively to add diffusion material to improve the color homogeneity of emergent light in phosphor powder layer.

But add the problem of diffusion material to be, owing to having increased exciting scattering of light, make exciting light have the exciting light of considerable part to be directly reflected back inciding after phosphor powder layer, and the energy loss that forms dorsad of transmission light splitting optical filter 115.Hold intelligiblely, the color of emergent light needing is more even, needs the diffusion material that adds just more, and exciting light energy loss is dorsad larger, and the efficiency of light source is lower.

In sum, apply current technical scheme, color homogeneity and efficiency that exciting light and Stimulated Light are mixed the light source of outgoing form conflict.

Summary of the invention

The technical problem underlying that the present invention solves is to propose a kind of light-emitting device based on material for transformation of wave length, can high efficiency transmitting exciting light and the even mixed light of Stimulated Light.

The present invention proposes a kind of light-emitting device, comprising:

For generation of the excitation source of exciting light;

Comprise the material for transformation of wave length layer of relative first surface and second surface, this material for transformation of wave length layer is for absorption portion exciting light the transmitting Stimulated Light different from excitation wavelength; This material for transformation of wave length layer comprises material for transformation of wave length and scattering material;

Be used for the light exit channel of the emergent light of this light-emitting device of outgoing;

Be positioned at the light directing arrangement of material for transformation of wave length layer first surface one side, this light directing arrangement is incident in the first surface of material for transformation of wave length layer for directs excitation light, and guides the Stimulated Light emitting from the first surface of material for transformation of wave length layer and the residual excitation light not absorbed by material for transformation of wave length layer to enter light exit channel.

The present invention also proposes a kind of projection arrangement, comprises that above-mentioned light-emitting device is as light source.

The present invention also proposes a kind of lighting device, comprises that above-mentioned light-emitting device is as light source.

In light-emitting device of the present invention, utilization is positioned at the light directing arrangement of material for transformation of wave length layer first surface one side can effectively collect the exciting light being reflected by material for transformation of wave length layer, make to add diffusion material to exert an influence to the efficiency of light-emitting device, and then solved the contradiction between color homogeneity and luminous efficiency.

Brief description of the drawings

Fig. 1 a and 1b are the optical texture schematic diagrames of two kinds of prior aries;

Fig. 2 is the optical texture schematic diagram of first embodiment of the invention;

Fig. 3 is the spectrum that utilizes the white light that the present invention obtains;

Fig. 4 is the optical texture schematic diagram of second embodiment of the invention;

Fig. 4 a and 4b are material for transformation of wave length layer in second embodiment of the invention and the top view of reflective;

Fig. 5 is the optical texture schematic diagram of third embodiment of the invention;

Fig. 6 is the optical texture schematic diagram of fifth embodiment of the invention;

Fig. 7 is the optical texture schematic diagram of sixth embodiment of the invention;

Fig. 8 is the optical texture schematic diagram of seventh embodiment of the invention;

Fig. 9 is the optical texture schematic diagram of fourth embodiment of the invention;

Detailed description of the invention

As described in the background art, in the light source package of the existing mixed light that can launch exciting light and stimulated luminescence, the uniformity of light source luminescent and efficiency form conflict, and its essential reason is that the reflection exciting light causing adding of scattering material cannot be utilized.The present invention proposes a kind of new light-source structure, one side in the exciting light incident of material for transformation of wave length layer is provided with light directing arrangement, this light directing arrangement is when directs excitation light is incident in material for transformation of wave length layer, can also guide the absorbed exciting light that do not have being reflected by material for transformation of wave length layer to enter the light exit channel of this light source, and then realized the recycling of the exciting light being wasted in the prior art, fundamentally solve the contradiction of uniformity of luminance and efficiency.

Light-emitting device of the present invention can high efficiency transmitting exciting light and the even mixed light of Stimulated Light.The possible constituent of such mixed light has a variety of, for example use blue excitation optical excitation yellow wavelengths transition material to produce the mixed light white light that yellow Stimulated Light can obtain both, or use green excitation red wavelength transition material to produce the mixed light gold-tinted that red Stimulated Light can obtain both.Just illustrate herein, do not limit other exciting light and using and combining of Stimulated Light.

The first embodiment of the present invention as shown in Figure 2.The light-emitting device of the second embodiment comprises the excitation source 200 for generation of exciting light 201, with the material for transformation of wave length layer 204 of also launching the Stimulated Light different from excitation wavelength for absorption portion exciting light.This material for transformation of wave length layer 204 comprises first surface 204a and two surfaces of second surface 204b, and exciting light 201 is incident in first surface wherein.

In the present invention, excitation source can have multiple choices, for example LASER Light Source, and LED source, or the hybrid light source of laser and light emitting diode, may be also that other can produce the light source for other kind of the exciting light of excitation wavelength transition material.If light-emitting device light source of the present invention, for the purposes showing or the meeting such as illumination is seen by human eye, at least comprises the spectral component of part visible ray in the spectrum of exciting light.The most frequently used excitation source is blue laser light source or blue light-emitting diode light source, but just illustrates herein, and the kind to light source and color do not limit.

The light-emitting device of the present embodiment also comprises the light exit channel for the emergent light of this light-emitting device of outgoing, and is positioned at the light collecting device 206 on this light exit channel, and this light collecting device 206 comprises light inlet 206a.The present embodiment also comprises the light directing arrangement 202 that is positioned at material for transformation of wave length layer 204 first surface 204a mono-side, this light directing arrangement 202 is incident in the first surface 204a of material for transformation of wave length layer 204 for directs excitation light 201, and guides the mixed light 203 of the Stimulated Light emitting from the first surface 204a of material for transformation of wave length layer and the residual excitation light not absorbed by material for transformation of wave length layer enter the light inlet 206a of light collecting device 206 and be directed into light exit channel.

In the present embodiment, light directing arrangement 202 comprises with light hole 202a and the reflection unit that is positioned at light hole surrounding reflecting surface 202b, this reflection unit is incident in the first surface 204a of material for transformation of wave length layer 204 with the mode directs excitation light 201 of transmission by light hole 202a, guide the Stimulated Light emitting from the first surface 204a of material for transformation of wave length layer 204 and the residual excitation light not absorbed by material for transformation of wave length layer to enter the light inlet 206a of light collecting device 206 by reflecting surface 202b in the mode of reflection simultaneously.

In the light-emitting device of the present embodiment, also comprise the reflective 205 with reflecting surface 205a, for reflecting exciting light and Stimulated Light.The second surface 204b of material for transformation of wave length layer 204 is arranged on the reflecting surface 205a of this reflective.Exist several different methods can realize this reflective, for example, on the surface of glass or smooth metal substrate, adopt mode plating reflecting layer or the dieletric reflection layer of sputter, or attach reflectance coating on any surface of the substrate of base material.

What deserves to be explained is, when the base material of reflective is that transparent material is for example when glass, the second surface 204b of material for transformation of wave length layer 204 also can be arranged at the opposite of the reflecting surface of reflective 205, and the exciting light and the Stimulated Light that are now incident in reflective can be incident in reflecting surface and be reflected through after the transparent base of reflective.In this case, because light can be at the internal communication of reflective, therefore facula area has certain diffusion, energy loss when this can cause light to enter the light inlet 206a of light collecting device 206; This energy loss can be avoided by the area of the light inlet 206a of expansion light collecting device 206.

In the practical work process of the light-emitting device of the present embodiment, exciting light 201 can be divided into two parts, and wherein Part I exciting light is absorbed by material for transformation of wave length layer 204, and converts Stimulated Light to by material for transformation of wave length layer.This Stimulated Light also can be divided into two parts, wherein Part I Stimulated Light can be transmitted directly to space outerpace, the reflecting surface 205a that Part II Stimulated Light can incide reflective 205 goes up and is reflected by it, finally shine space outerpace, and form together with Part I Stimulated Light from the Stimulated Light of the first surface 204a transmitting of material for transformation of wave length layer.Part II exciting light can not absorbed by material for transformation of wave length layer 204, but is directly reflected by material for transformation of wave length layer 204.Therefore on wavelength, can be divided into two compositions from the emergent light 203 of material for transformation of wave length 204 transmittings, only exciting light of the first composition, the Stimulated Light that the second composition is only launched from the first surface 204a of material for transformation of wave length layer 204.

On material for transformation of wave length 204, the emergent light 203 of transmitting spatially can be divided into again two parts, thereby First branch is incident in the reflecting surface 202b of curved reflectors, light inlet 206a upper and that reflexed to light collecting device 206 by it enters light exit channel, and Part II can go out to be shot out to form loss from light hole 202a.The ratio that accounts for total light energy due to the Part II of emergent light 203 is very little, and the loss that therefore Part II of emergent light 203 causes is often negligible.In a preferred embodiment, in order to improve the utilization rate of Part II of emergent light 203, one filter part 207 can be set in the position of the light hole 202a of curved reflectors, this filter part 207 can see through exciting light 201, can reflect Stimulated Light simultaneously, thereby the light inlet 206a that therefore Stimulated Light in the Part II of emergent light 203 becomes branch to be reflexed to light collecting device 206 by filter part 207 makes it enter light exit channel, but exciting light composition in the Part II of emergent light 203 still can go out to be shot out and causes damage.

In sum, the emergent light that enters the light-emitting device of light exit channel is the mixed light of exciting light and two kinds of compositions of Stimulated Light.But the luminous distribution of these two light components is different.As described in the background art, wherein to distribute be isotropic to the light of Stimulated Light, i.e. lambertian distribution, although and exciting light part through the scattering of material for transformation of wave length, its light distributes still cannot be identical with Stimulated Light.This be because, a lot of exciting lights can directly be incident in reflective 205 in the space through material for transformation of wave length while propagation in material for transformation of wave length layer 204, again pass a part that becomes emergent light 203 from the space between material for transformation of wave length being reflected after substrate 205 reflections.The light of this part of exciting light distributes, and owing to not passing through scattering process, is to distribute identical with the light of incident exciting light 201.Therefore, in emergent light 203 light of two light components of exciting light and Stimulated Light distribute different, this will inevitably reduce the color homogeneity of emergent light 203.For example, in the time using blue light laser diode as excitation light source excites yellow wavelengths transition material, because the directionality of laser is very strong, the light color of propagating along luminous axis direction of final emergent light 203 is partially blue, and partially yellow with the color of the larger light in luminous axis angular separation.

The content that increases material for transformation of wave length layer 204 medium wavelength transition material can reduce the amount of the exciting light directly passing from the gap of material for transformation of wave length, but this also must increase the ratio of the Stimulated Light composition in emergent light 203 simultaneously, and then has influence on the color of emergent light 203.

Adding of diffusion material can make the light distribution of the exciting light composition in emergent light 203 become or approach isotropism in the case of not changing the color of emergent light 203, and then greatly improves the color homogeneity of emergent light 203.In general, scattering material is white or transparent inorganic powder material, such as but not limited to white carbon, titanium dioxide, aluminium oxide, diatomite and barium sulfate.Although its inside of transparent powder body material can not form scattering to light, but when light incident its when surface is due to the existence of interfacial refraction rate difference, incident ray still can reflect with part by generating unit sub reflector, therefore still can form to light on the whole the effect of scattering.

Experiment shows, in material for transformation of wave length layer 204, the mass ratio of scattering material and material for transformation of wave length is greater than at 0.1 o'clock, and the uniformity of emergent light 203 will obtain the improvement of certain degree; In the time that the mass ratio of scattering material and material for transformation of wave length is greater than 1, the uniformity of emergent light 203 can meet instructions for use.And the ratio of the exciting light requiring in the mass ratio of scattering material and material for transformation of wave length and emergent light 203 and Stimulated Light about: the ratio of the exciting light of requirement is higher, and the mass ratio of scattering material and material for transformation of wave length will be larger.

For example, be used to excite yellow wavelengths transition material layer to produce the situation of the emergent light of white light for blue laser as exciting light, if requiring the colour temperature of the white light of outgoing is 5000-6000K, needing the scattering material that adds and the mass ratio of material for transformation of wave length is 2, and its luminescent spectrum is as shown in 302 in Fig. 3; And if the colour temperature that requires the white light of outgoing is 9000-10000K, needing the scattering material that adds and the mass ratio of material for transformation of wave length is 10, and its luminescent spectrum is as shown in 301 in Fig. 3.Therefore, can recently adjust by adjusting the quality of scattering material and material for transformation of wave length the color of the mixed light of penetrating.

In material for transformation of wave length layer 204, between material for transformation of wave length and scattering material, there is multiple hybrid mode, the hybrid mode for example the most easily realizing is even mixing.In the present embodiment, first preferred hybrid mode is that material for transformation of wave length forms material for transformation of wave length sublayer, scattering material forms scattering material sublayer, material for transformation of wave length sublayer and this scattering material sublayer layering stack together, and scattering material sublayer more approaches the first surface 204a of material for transformation of wave length layer 204 with respect to material for transformation of wave length sublayer.Now exciting light 201 is first incident in scattering material sublayer, and after a part of exciting light is reflected, through curved reflectors, guiding enters light exit channel, and all the other exciting lights incide material for transformation of wave length sublayer and are absorbed generation Stimulated Light.With respect to material for transformation of wave length and the mixed uniformly scheme of scattering material, exciting power decreases owing to being subject to the scattering of scattering material sublayer in this preferred hybrid mode, to incide the exciting light of material for transformation of wave length, and this conversion efficiency for material for transformation of wave length stimulated luminescence is helpful.

Second preferred hybrid mode of the present embodiment medium wavelength transition material and scattering material is, scattering material sublayer more approaches reflective 205 with respect to material for transformation of wave length sublayer, and this scattering material sublayer is arranged in reflective 205 and becomes the part of this reflective.This reflective utilizes the scattering of its lip-deep scattering material sublayer and the characteristic of reflection also to realize light scattering function in realizing its light reflection function.

The way of the material for transformation of wave length layer that comprises material for transformation of wave length and scattering material has multiple.For example can use binding agent that material for transformation of wave length and scattering material are fixed together and form sheet.Binding agent can be organic binder bond, and for example silica gel or epoxy resin can be also inorganic binders, such as waterglass etc.In fact, also can not use binding agent and directly utilize scattering material itself that material for transformation of wave length is connected and fixed.For example, in the time that scattering material is nanometer silicon dioxide particle, can utilize Van der Waals force and intermolecular force between nanometer silicon dioxide particle and material for transformation of wave length particle that material for transformation of wave length particle is connected and is fixed together.The use of above material just for example, does not limit the use of other material.

It should be noted that, the present invention does not limit the particle size of the particle of scattering material, but in order to realize good light scattering effect, the average grain diameter of the particle of scattering material exists a preferable range, 0.1 micron to 50 microns, wherein the most frequently used scope is 1 micron to 20 microns.

In the light-emitting device of the present embodiment, reflection unit is curved reflectors.As a preferred embodiment, curved reflectors is hemispherical or a hemispheric part, the be excited position of light 201 incidents of material for transformation of wave length layer 204 is positioned at the first point near this hemispherical centre of sphere, the light inlet 206a of light collecting device 206 is positioned at the second point near this hemispherical centre of sphere, and first and second point are about this hemispheric centre of sphere symmetry.Can ensure preferably like this after the reflecting surface 202b reflection of curved reflectors, to incide the light inlet 206a of light collecting device 206 from the be excited emergent light 203 of position transmitting of light 201 incidents of material for transformation of wave length layer 204.In this preferred embodiment, the advantage that is the curved reflectors of hemispherical or a hemispheric part is to be easy to processing, and in a further advantageous embodiment, curved reflectors is a part for semielliptical shape or semielliptical shape, the be excited position of light 201 incidents of material for transformation of wave length layer 204 is positioned at a focus of semielliptical shape, and the light inlet 206a of light collecting device 206 is positioned at another focus of this semielliptical shape.In this embodiment, light collection efficiency is higher, but shortcoming is that the processing cost of curved reflectors of a part that is semielliptical shape or semielliptical shape is higher.

In sum, in the light-emitting device of the present embodiment, by add diffusion material in material for transformation of wave length layer 204, can effectively improve the color homogeneity of emergent light; Simultaneously, because can effectively guiding the exciting light being reflected by material for transformation of wave length layer, light directing arrangement 202 enters light exit channel, thereby diffusion material add the reduction that can't cause light-emitting device efficiency, and then solved the contradiction between the color homogeneity of emergent light and the efficiency of light-emitting device.

In the light-emitting device of the second embodiment of the present invention, different from the first embodiment, also comprise drive unit, for driving material for transformation of wave length layer and exciting light generation relative motion, as shown in Figure 4.Specifically, in the light-emitting device of the present embodiment, material for transformation of wave length layer 404 is cut into circular, and reflective 405 is cut into circle, as shown in the top view of Fig. 4 a.Material for transformation of wave length layer 404 and drive unit 410 are connected and fixed with reflective 405 respectively.In the present embodiment, drive unit 410 is motors, can drive reflective 405 and material for transformation of wave length layer to rotate around the turning cylinder of motor.The advantage of the present embodiment is, the irradiation position that each local material for transformation of wave length only moves to exciting light 401 just can be excited and the evolution of heat, can be cooling rapidly due to the effect of Air Flow in other position, so with respect to the first embodiment, the temperature of the material for transformation of wave length layer in the present embodiment is lower.

In the light-emitting device of the present embodiment, as shown in Figure 4 b, in circular reflective 405, can also comprise that other wavelength turns material layer 404a and 404b.Along with the rotation of motor, material for transformation of wave length layer 404,404a and 404b are excited that light 403 irradiates and successively at the light of light exit channel outgoing different colours.It is worth emphasizing that, in material for transformation of wave length layer 404a and 404b, can not add diffusion material, make the exciting light composition in corresponding emergent light little.

The 3rd embodiment of the present invention as shown in Figure 5, different from the second embodiment, reflection unit in the present embodiment comprises with light hole 502a and is positioned at the first plane reflection device 502 of reflecting surface 502b of light hole surrounding, this the first plane reflection device 502 incides the first surface of material for transformation of wave length layer 504 with the mode directs excitation light 501 of transmission by light hole 502a, guide the mixed light 503 of the Stimulated Light emitting from the first surface of material for transformation of wave length layer 504 and the residual excitation light not absorbed by material for transformation of wave length layer to enter light exit channel 506 by the reflecting surface 502b of a plane reflection device 502 in the mode of reflection simultaneously.

Be worth pointing out, in the present embodiment, also comprise a collecting lens 509, for transmission exciting light 501, and collect from the exciting light of material for transformation of wave length layer reflection and the mixed light 503 of Stimulated Light and make it form a light beam, the diameter of this light beam is greater than the beam diameter of exciting light 501.Utilize the difference of the beam diameter size of mixed light 503 and exciting light 501, the first plane mirror can be separated the light path of the two.The difference of embodiment shown in this and Fig. 1 a is, owing to not utilizing wavelength that the light path of exciting light and Stimulated Light is separated, so there is exciting light and Stimulated Light on light exit channel 506 simultaneously.

The 4th embodiment of the present invention as shown in Figure 9.Different from the second embodiment, the reflection unit in the present embodiment is zigzag reflection unit 902, wherein at least comprises two serrated face 902b1 and 902b2, and each serrated face is a part for one group of concentric spherical.Describe and can know with reference to the operation principle in the second embodiment, serrated face 902b1 and 902b2 can play respectively the effect of curved reflectors in the second embodiment, therefore zigzag reflection unit can be regarded as the nested combination of one group of curved reflectors, therefore for the Stimulated Light that emits of first surface there is the effect identical with curved reflectors with the mixed light of the residual excitation light not absorbed by material for transformation of wave length layer.The difference of zigzag reflection unit and curved reflectors is, the shared space of zigzag reverberation device is less, more compact structure.

The 5th embodiment of the present invention as shown in Figure 6, different from the 3rd embodiment, in the present embodiment, light directing arrangement comprises the second plane reflection device 602, and this second plane reflection device 602 incides the first surface of material for transformation of wave length layer 604 with the mode directs excitation light 601 of reflection; The mixed light 603 of the Stimulated Light that the first surface of material for transformation of wave length layer 604 emits and the residual excitation light that do not absorbed by material for transformation of wave length layer penetrates through the second plane reflection device 602 the light inlet exit channel 606 of going forward side by side around.

The 6th embodiment of the present invention as shown in Figure 7, different from the second embodiment, light directing arrangement comprises with light hole 702a and is positioned at the curved reflectors 702 of reflecting surface 702b of light hole surrounding, this curved reflectors 702 is incident in the first surface of material for transformation of wave length layer 704 with the mode directs excitation light 701 of transmission by light hole 702a, guide the mixed light 703a of the Stimulated Light emitting from the first surface of material for transformation of wave length layer 704 and the residual excitation light not absorbed by material for transformation of wave length layer to be again incident in the first surface of material for transformation of wave length 704 by reflecting surface 702b in the mode of reflection simultaneously, and after wavelength transition material layer 704, enter light exit channel 706 and form emergent light 703 penetrating.

In the present embodiment, the substrate 705 of material for transformation of wave length layer is transparent material, and for example glass can allow light to see through.

In the present embodiment, mixed light 703a is incident in the first surface of material for transformation of wave length layer 704 after being reflected by the reflecting surface 702b of curved reflectors 702, wherein part can penetrate the wavelength transition material layer 704 light inlet exit channel 706 of going forward side by side, remainder is reflected by material for transformation of wave length layer 704, and is again incident in the first surface of material for transformation of wave length layer 704 by the reflecting surface 702b of curved reflectors 702 reflection; So continuous circulation, every circulation primary has part mixed light 703a transmission peak wavelength transition material layer to enter light exit channel 706.Finally, all mixed light 703a are able to transmission peak wavelength transition material layer 704 and enter light exit channel 706.

In the present embodiment, curved reflectors is hemispherical or a hemispheric part, and the be excited position of light incident of material for transformation of wave length layer is positioned at the hemispheric centre of sphere.According to geometric knowledge, the light sending from the centre of sphere can return to the centre of sphere by spheric reflection.

With reference to the 4th embodiment, the curved reflectors in the sixth embodiment of the present invention also can change zigzag reflection unit into, and light is played and the effect of the identical mistake of curved reflectors.

The seventh embodiment of the present invention as shown in Figure 8, different from the 5th embodiment is, light directing arrangement in the present embodiment comprises interferometric filter 802, and this interferometric filter 802 is incident in the first surface of material for transformation of wave length layer with the mode directs excitation light 801 of transmission.The spectrum characteristic of interferometric filter 802 is that it is transmitted into the exciting light that firing angle is less than the first predetermined angular, and is reflected into the exciting light that firing angle is greater than the second predetermined angular, reflects Stimulated Light simultaneously.

The light schematic diagram of the present embodiment in practical work process as shown in Figure 8 a.Exciting light 801 is divided into three parts after being incident in material for transformation of wave length layer 804 after interferometric filter 802, Part I exciting light is absorbed and for generation of stimulated luminescence, Part II exciting light 803a2 is reflected onto interferometric filter 802, and Part III exciting light directly penetrates wavelength transition material layer 804 and forms a part of 803a1 of emergent light and enter light exit channel 806.After the exciting light that incidence angle in the exciting light 803a2 being reflected is greater than the second predetermined angular is reflected by interferometric filter 802, be again incident in the first surface 804a of material for transformation of wave length layer 804, and after wavelength transition material layer 804, enter light exit channel 806 penetrating.

Stimulated Light is divided into two parts, Part I Stimulated Light 803b1 is transmitted directly to the space outerpace light inlet exit channel 806 of going forward side by side, Part II Stimulated Light 803b2 incides on interferometric filter 802 and is reflected and is again incident in the first surface 804a of material for transformation of wave length 804, and after wavelength transition material layer 804, enters light exit channel 806 penetrating.

In the present embodiment, the energy that adds the exciting light that membership increase is reflected of scattering material in material for transformation of wave length layer 804, but the incident angle in the exciting light these being reflected due to interference filter sector-meeting is greater than again the reflecting back of light of the second predetermined angular, these exciting lights are able to finally from 806 outgoing of light exit channel, thus make due to adding of scattering material produced energy loss greatly reduce.

In the exciting light being reflected by material for transformation of wave length 804, the light 803a3 that incident angle is less than the second predetermined angular can penetrate interferometric filter and forming energy loss, but this part loss is often very little.For example, the scope of the first the most frequently used predetermined angular is 10 degree to 25 degree, and the scope of the second corresponding predetermined angular is 20 degree to 40 degree.When the second predetermined angular is 20 while spending, in the exciting light being reflected by material for transformation of wave length layer, 88% can again be reflected and be used by interferometric filter.Above angular range just for example, does not limit the use of other angle.

In the present embodiment, the reflection loss when making exciting light 801 transmission interference filter 802 is less, and preferred, the incidence angle that is incident in interferometric filter 802 that should adjust exciting light 801 is less than the first predetermined angular.In addition, for fear of light constantly expansion of the caused spot size of reflection between interferometric filter 802 and material for transformation of wave length layer 804, preferred, interferometric filter 802 is closely adjacent with material for transformation of wave length layer 804; Be more preferably, the coated surface of interferometric filter 802 should be faced material for transformation of wave length layer 804, and has air-gap between interferometric filter 802 and material for transformation of wave length layer 804.This air-gap has obvious help for interferometric filter 802 to the raising of Stimulated Light reflectivity.

The present invention also proposes a kind of projection arrangement, in this projection arrangement, has used above-mentioned light-emitting device as light source.

The present invention also proposes a kind of lighting device, in this projection arrangement, has used above-mentioned light-emitting device as light source.

The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (17)

1. a light-emitting device, comprising:
For generation of the excitation source of exciting light;
Comprise the material for transformation of wave length layer of relative first surface and second surface, described material for transformation of wave length layer is for absorption portion exciting light the transmitting Stimulated Light different from excitation wavelength;
Be used for the light exit channel of the emergent light of this light-emitting device of outgoing;
Be positioned at the light directing arrangement of material for transformation of wave length layer first surface one side, this light directing arrangement is incident in the first surface of described material for transformation of wave length layer for directs excitation light, and guides the Stimulated Light emitting from the first surface of material for transformation of wave length layer and the residual excitation light not absorbed by material for transformation of wave length layer to enter light exit channel;
It is characterized in that,
Described material for transformation of wave length layer comprises material for transformation of wave length and scattering material;
Described light directing arrangement comprises interferometric filter, and this interferometric filter is transmitted into the exciting light that firing angle is less than the first predetermined angular, and is reflected into the exciting light that firing angle is greater than the second predetermined angular, reflects Stimulated Light simultaneously;
Described interferometric filter is incident in the first surface of material for transformation of wave length layer with the mode directs excitation light of transmission;
Described interferometric filter guides the Stimulated Light emitting from the first surface of material for transformation of wave length layer to be again incident in the first surface of described material for transformation of wave length in the mode of reflection, and after wavelength transition material layer, enters described smooth exit channel penetrating;
Described interferometric filter guides the first surface that emits the residual excitation light not absorbed by material for transformation of wave length layer and incidence angle is greater than the second predetermined angular and be again incident in described material for transformation of wave length layer from the first surface of material for transformation of wave length layer in the mode of reflection, and after wavelength transition material layer, enters described smooth exit channel penetrating.
2. light-emitting device according to claim 1, is characterized in that: described exciting light is blue light.
3. light-emitting device according to claim 1, is characterized in that: described scattering material is white or transparent inorganic powder material.
4. light-emitting device according to claim 1, is characterized in that: the mass ratio of described scattering material and described material for transformation of wave length is greater than 0.1.
5. light-emitting device according to claim 4, is characterized in that: the mass ratio of described scattering material and described material for transformation of wave length is greater than 1.
6. light-emitting device according to claim 5, is characterized in that: the mass ratio of described scattering material and described material for transformation of wave length is greater than 2 and be less than 10.
7. light-emitting device according to claim 1, is characterized in that: described material for transformation of wave length evenly mixes with scattering material.
8. light-emitting device according to claim 1, is characterized in that: described material for transformation of wave length forms material for transformation of wave length sublayer, and described scattering material forms scattering material sublayer, and described material for transformation of wave length sublayer and the layering of scattering material sublayer stack together.
9. light-emitting device according to claim 8, is characterized in that: described material for transformation of wave length sublayer more approaches described first surface with respect to described scattering material sublayer.
10. light-emitting device according to claim 8, is characterized in that: described scattering material sublayer more approaches described first surface with respect to described material for transformation of wave length sublayer.
11. light-emitting devices according to claim 1, is characterized in that: described material for transformation of wave length layer also comprises binding agent, for fixing described material for transformation of wave length and the scattering material of boning.
12. light-emitting devices according to claim 1, is characterized in that: also comprise drive unit, for driving described material for transformation of wave length layer and described exciting light generation relative motion.
13. light-emitting devices according to claim 1, is characterized in that: the incidence angle that described exciting light is incident in described interferometric filter is less than the first predetermined angular.
14. light-emitting devices according to claim 1, is characterized in that: described interferometric filter is closely adjacent with described material for transformation of wave length layer.
15. light-emitting devices according to claim 14, is characterized in that: between described interferometric filter and described material for transformation of wave length layer, have air-gap.
16. 1 kinds of projection arrangements, is characterized in that: comprise that light-emitting device as described in any one in claim 1 to 15 is as light source.
17. 1 kinds of lighting devices, is characterized in that: comprise that light-emitting device as described in any one in claim 1 to 15 is as light source.
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